Update and add-on problem
When you do the update the installer file it should be an .msi file. if the one you have is zipped, unzip the file in a temporary file location, and the double click the [filename].msi file.  You should ensure that you install it in the same directory as previous installations, if you did not use the default for your previous or first install.

The addon, after it is unzipped should be a *.py file; you can find help on this installation at this location: Installing an addon